/Engine/Source/Runtime/Engine/Classes/Kismet/GameplayStatics.h
This will write out all non-transient properties, the SaveGame property flag is not checked
Whether we successfully saved this information
static bool SaveGameToSlot ( [USaveGame](API\Runtime\Engine\GameFramework\USaveGame) * SaveGameObject, const [FString](API\Runtime\Core\Containers\FString) & SlotName, const int32 UserIndex )